977316021 has 24 divisors (see below), whose sum is σ = 1540995456. Its totient is φ = 591935040.

The previous prime is 977316017. The next prime is 977316029. The reversal of 977316021 is 120613779.

It is a happy number.

It is not a de Polignac number, because 977316021 - 2² = 977316017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977316029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290676 + ... + 294018.

It is an arithmetic number, because the mean of its divisors is an integer number (64208144).

Almost surely, 2^977316021 is an apocalyptic number.

It is an amenable number.

977316021 is a deficient number, since it is larger than the sum of its proper divisors (563679435).

977316021 is a wasteful number, since it uses less digits than its factorization.

977316021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6313 (or 6310 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 977316021 is about 31262.0540112130. The cubic root of 977316021 is about 992.3807684157.

The spelling of 977316021 in words is "nine hundred seventy-seven million, three hundred sixteen thousand, twenty-one".